System of electrical distribution.



PATENTED APR. 2, 1907. M. 0. TROY, SYSTEM 01" ELECTRICAL DISTRIBUTION.

APPLIOATION FILED JULY 19, 1902- VII messes To all whom it may concern.-

' other translating devices possessing in uct 4 potential, I. 1110 udein the circulta device bein UNITED STATES PATENT OFFICE.

MATTHEW O. TROY, LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF YORK.

-SYSTEM OF ELECTRICAL' DISTlRlBUTlON.

No. 848,935. a

Patented April 2, 1907.

7 Application filed July 19 1902. Serial No. 116,208.

Be it known that I, MATTHEW O. TROY, a citizen of the United States,residing at Lynn, in the county of Essex, State of Mas- .sachusetts,have invented certain new and useful Improvements in Systems ofElectrical Distribution, of which the following is a specification. v

" My present invention relates to a system in which .a circuitcontaining a ser1es of translating devicessuch, for exam le, as

arc-lamps -is supplied with energy erived from a source of current ofconstant potentie], and comprises certain improvements whereby aconstant current may be maintained 1n the circuit supplying thearc-lamps or other translating devices.

In carrying my invention into practice I provide means for preventingthe re ulation -of the system from being affected y harmonies in thecurrent-wave and also f0r'com pensating for the objectionable effectupon the regulation of the system due to changes in the voltage of theconstant-potential sup ly.

he novel'features which I believe charac- Y terize my invention I havepointed out with particularity in the appended claims, the invention.itself, as illustrated by one of the various embodiments of which it iscapable, described in detail in the following s ecifica-tion, which isto be taken in connectlon with the accompanying drawings, in which- IFigure 1 is adia of a system embod Fi s. 2 and 3 views of a transformerof variammatic representation suchasystem. I The circuit to beregulated, whichis a series circuit, is intended to supply arc-lam s orance. To secure a constant-current regulation 1n sucn a circuit whenconnected across a source of su pl of substantially constant possessingcapacity'su ch, for example, as 'a condenser or condensers,polarization-cells, or

. the rimary of a transformer the secondary device possessing capacity.The amount of ymg my invention, and

impedance is sufficient to cause current of the desired value to flow inthe constant-current circuit. When lamps or other translating devicesare'cut into the circuit, their in-' ductance neutralizes acorresponding ortion of the capacity of thecondenser or 0t er device ordevices possessing capacity. The total impedance of the circult,therefore, does not change appreciably, so that thecurrent remains ofthe load. find, howeve'r, if special precautions are not, taken toprevent it, that the reagulation of the system may be seriously a ectedthrough the magnifying action of the condenser or other devicepossessing capacity upon such harmonics of minorcharacter as may existin the current-wave. In application, Serial No; 86,473, filed by me onor practically constant regardless about DecemberlQ, 1901, I proposed toobviate this objectionable action by connecting in series with acondenser a device possessin inductance and to increase the capacity 0?the condenser sufficiently to balance the effect of the inductance Thepresence" of the inductance in the circuit operates to suppressharmonics in the current-wave, thereby preventing them from beingmagnified by the condenser and the regulation of the s stem thusimpaired. I have found that w ere a transformer is .used for feeding theconstantcurrent'system I may omit the inductance in series-with. theconstant-current circuit and make use-of the inductance of thetransformer'in place thereof. To this end I de-:

sign the transformer so as tohave a relatively lar "e amount ofinductive reactance,

and, in a dition, I make the transformer off such a constructionthatthis reactance m'ay be varied either manually or.- automatically,

lAisystem such as I have'described briefly 1, in which the source of isind cated in constant-potentia current is represented by the mains-12.

Leads ,3 '4 *extendtherefrom "and supply current to the primary 5'-'of ava-' riable-reactance' transformer constructed in of w ich is closedupon .a condenser or other,

accordance with my invention. The secondary-6 of this transformersupplies current to other inductive translating devices 7 L 1 L 11 seasdesired. By varying the reactance I may 7 9'5 ly-jstation, such astakesplace when the the series circuit containing arc-lam s; ,or

ries with the arc-lampicircuit are -connected tions in the voltage of tI have devised a construction in whic otherwise result from the presenceof the inductance of the transformer, I connect in circuit a device ordevices possessing capacity sufficient to neutralize this inductance. Inthe present instanceI make use of a condenser 9, connected in serieswith theprimary of the transformer, though it might, if desired,beconnected in series with .the secondary circuit. The' inductance ofthe transformer therefore, has practicallyno effect upon the powerfactor of the system, but operates, nevertheless, to damp out anyharmonics which may tend to exist in the current-wave, and therebyprevents the regulation of the system from being impaired thereby.

In order to vary thereluctance of the transformer for the purpose eitherof initial adjustment or for complensating for variae source of sulppolge reluctance between the primary and secondary GOIlS may be varied byinserting or withdrawing a mass of magnetic material which varyinwithdrawa operates as a variable shunt for the degree of its insertionor the lines of force produced by the primary winding.

The mechanical construction em loyed is indicated with some degree ofdetai in Figs.

I 2 and 3. The core of the transformer, which is: of the shell type,having acentral member uponwhich the. coils are mounted, as indi.--

cated. in Fi 1, is shown in side elevation in Figs. 2 an 33 at 1 0. Theprimary and sec-1 ondary coils 5 6 are mounted upon this core and thewhole is supported by a frameworlr cons sting of u per and lower members11 and 12,betweenw -'ch the core is clamped.

'14, having bearin or cord The lower member 12 is provided withsupporting-standards for holding the apparatus men upright position. Theupper member 11 is provided in its turn with standards 13 .in their uper ends for a shaft 15, provide at its midd e portion with .56 awindinwheel 16, over which passes a re e I 2 cm. which is suspended two bloc18, of laminated iron, connected to ether byacrossbar 19. These blocksare a aptedg if -tribemoved up or. down between the primary;

and secondary coils of the transformer, thereby constituting a variablemagnetic;

shunt for the flux interlinking the coils.

These blocks run on guides 20 and 21 and are conveniently moved by meansof the handwheel 22. When the parts have been adjusted to the positiondesired, they may be prevented from further movement by clamping theshaft 15 from rotation by means of the clamping-nut'23, provided forthat purpose. The manner in which the magnetic shunt diverts lines offorce and prevents them from traversing the secondary winding isconventionally indicated by the dotted lines inFig. 1. p

What I claim as new, and desire to secure by Letters Patent of theUnited States, is 1. The combination of a series circuit containingtranslating devices possessing inductance, a device possessing capacityalso in said circuit, and a transformer for supplying current to saidcircuit, said transformer possessing sufficient inductive reactance tonlter out or su press harmonics.

2. The combination of a transformer havinga magnetic circuit ofadjustable reluctance, a series circuit containing translating devicespossessing inductance, and means in said circuit for maintaining aconstant current therein.

3. The combination of a transformer of variable reactance, a seriescircuit containing translating devices fed thereby, and a devicepossessing the effect of capacity in series in said circuit.

4. The combination of a series circuit containing translating devicespossessing inductance, a device possessing capacity in series in'saidcircuit, and a source of currentfor sup:

means for varying the" reluctance of the leak- I ageatlr between theprimary and secondary of said transformer, means for supplying saidtransformer with current from a source of nominally-constant potential,a series circuit containing translating devices connected to thesecondary of said transformer, a device possessing capacity in series insaid circuit for securing a substantially constant current regulation insaid circuit, and additional means for compensating for the effect ofthe inductance of the transformer upon the system. a

. 6. A reg'ulable stationar induction apparatus consisting of a closecore, coils spaced apart on said core, a flux-shunt of magnetic materialmovable into and out of the space between said coils, and means forholding said flux-shunt in any chosen position within its range ofmovement.

7. Aregulable stationary induction appai ratus consisting of a closedcore, coils mounted onsaid core so as to provide a leakage- XZO neticmaterial, a device for raising and lowering said fluX-shuntin saidleakage-space, and means for holding said flux-shunt in any chosenposition Within its range of move ment.

8. Means for improving the power factor of an alternateing-currcntcircuit consisting of a condenser, and a device possessing inductance incircuit with said condenser and operating to screen out harmonics.

9. A regulable stationary induction apparatus consisting of .a closedmagnetic core,

coils mounted on said core so as to provide betweenthem a leakage-spacefor magnetic A flux, a flux-shunt of magnetic material, movable into andout of said leakage-space, and a hand-Wheel for raising and loweringsaid fluxshunt.

In Witness whereof I have hereunto set my hand this 16th day of July,1902,

. MATTHEW O. TROY.

Witnesses:

ALEX. F. MACDONALD, BENJAMIN B. HULL.

